Houston Democratic Congresswoman Sheila Jackson Lee is pressing the Justice Department to launch a task force investigation into attacks on the Sikh community in the wake of six killings at a Sikh temple in suburban Milwaukee.

Jackson Lee, a long time civil rights advocate elected to Congress in 1994, asked Attorney General Eric Holder to look into the number of attacks nationwide to “determine if additional law enforcement resources need to be put into place” to protect Sikhs.

The lawmaker told Holder in her letter that the Justice Department ought to “establish procedures to address incidences impacting targeted communities based on race or religion.”

There are about 300,000 Sikhs in the United States and 27 million adherents to the faith worldwide.

Jackson Lee released her letter to Holder as the FBI continued looking into the killing of six members of the Sikh community in Oak Creek, Wisconsin on Sunday. Officials have designated the attack an act of domestic terrorism.

The alleged shooter, Wade Michael Page, 40, committed suicide after being wounded by a police officer. Evidence gathered by federal and state authorities has linked Page to white supremacist groups.

The FBI’s special agent in charge in Milwaukee, Teresa Carlson, said investigators have not linked Page to any other suspects or found any note left by Page.

“We just want to get to the bottom of what motivated him to do it,” Amardeep Singh, an executive with the New York-based Sikh Coalition, told the Associated Press. “It’s important to acknowledge why they lost their lives.”

The Southern Poverty Law Center described Page as a “frustrated neo-Nazi” who played in white-power bands including Definite Hate and End Apathy.

“The recent attacks on the Sikh community in Oak Creek, Wisconsin have once again raised the growing concern of intolerance and a form of domestic terrorism that we are finding more common since the attacks on September 11, 2001,” Jackson Lee wrote the attorney general.

“I call upon the U.S. Department of Justice to fully investigate this matter to ensure the American people that this type of terror will not be tolerated in America by foreign or domestic terrorists on any people or religion.”